Tough clean

I have incountered several windows that look like they have watter spots all over the window but impossable to remove. It is sometimes behind a screen and sometimes not. Have used everything from sope and water to acitone with negative results. Any suggestions??

Sounds like hard water stains to me.

Here's a little info:
http://tinyurl.com/ot32f

HTH.

Thanks!!!!

I'd mention LimeAway and try a fine steel wool pad. Steel wool has become my new friend =)

I recently purchased a product from Home Depot called Spot-X Hard Water Stain/Spot remover which works very well for hard water stains. No need for steel wool with this, just a cloth or sponge. water and of course a little of the Spot-X.

You can also us an acid base cleaner such as certain toilet bowl cleaners but the Spot-X is a safer and easier way to go.

You should probably use a professional grade chemical if you plan on doing hard water stain removal, which is considered glass restoration. You should also be aware of "Tin Etch Haze". Most glass has a thin layer of tin on one of the surfaces; if you apply an acid, it etches the tin, thus ruining the window. You can detect which layer is coated with tin using a UV light. The UV light will case a gray hue on the tin side, whereas the plain "safe" side will reflect clearly. Look into SafeRestore made by EastCo Chemcials and another product from which im unsure about the manufactor, BioClean. Crystal Clear 500 (CC500) by Winsol is also a good product. Removing hard water stains is much more complicated then rubbing toilet bowl cleaner on the glass. Because of that, you can charge accordingly.